A specimen for measuring a material under multiple strains and strain rates. In a process that the output voltage gradually rises and gradually falls, the oscillation frequency of the oscillation signal gradually rises and gradually falls, a time interval at which the main switching element is set into a conductive state is extended. In one aspect, performance, manufacturing, trend andor other data are stored in non-volatile memory of the battery and are communicated to an external system such as a UPS. The solution is washed and filtered by a washing agent.